Graphical notations have been widely accepted as an expressive and intuitive working tool for system specification and design. This paper outlines a declarative approach based on (hyper-)graphs and graph synchronization to deal with the modeling of Wide Area Network applications. This paper aims at contributing to the understanding of crucial issues involved in the specification and design of Wide Area Network systems, as a first step toward the development of software engineering techniques and tools for designing and certificating internetworking systems.
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